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書名： XNA 4.0 Game Development by Example Beginner's Guide（Visual Basic Edition）
作者名： Kurt Jaegers
本章字數： 250字
更新時間： 2021-08-20 15:50:38

Time for action – GamePiece class methods – part 1 – updating

Add the following methods to the GamePiece class:
```
Public Sub SetPiece(type As String, suffix As String)
  _pieceType = type
  _pieceSuffix = suffix
End Sub

Public Sub SetPiece(type As String)
  SetPiece(type, "")
End Sub

Public Sub AddSuffix(suffix As String)
  If Not _pieceSuffix.Contains(suffix) Then
    _pieceSuffix &= suffix
  End If
End Sub

Public Sub RemoveSufix(suffix As String)
  _pieceSuffix = _pieceSuffix.Replace(suffix, "")
End Sub
```
The first two methods are overloads with the same name, but different parameter lists. In a manner similar to the GamePiece constructors, code that wishes to update a GamePiece can pass it a piece type and, optionally, a suffix.
Additional methods have been added to modify suffixes without changing the pieceType associated with the piece. The AddSuffix() method first checks to see if the piece already contains the suffix. If it does, nothing happens. If it does not, the suffix value passed to the method is added to the _pieceSuffix member variable.
The RemoveSuffix() method uses the Replace() method of the String class to remove the passed suffix from the _pieceSuffix variable.

Rotating pieces

The heart of the Flood Control play mechanic is the ability of the player to rotate pieces on the game board to form continuous pipes. In order to accomplish this, we can build a table that, given an existing piece type and a rotation direction, supplies the name of the piece type after rotation. We can then implement this code as a switch statement:

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XNA 4.0 Game Development by Example Beginner's Guide（Visual Basic Edition）

Time for action – GamePiece class methods – part 1 – updating

Rotating pieces